Bump vllm from 0.10.0 to 0.20.0 in /src/fara/vllm

Bumps [vllm](https://github.com/vllm-project/vllm) from 0.10.0 to 0.20.0.
- [Release notes](https://github.com/vllm-project/vllm/releases)
- [Changelog](https://github.com/vllm-project/vllm/blob/main/RELEASE.md)
- [Commits](https://github.com/vllm-project/vllm/compare/v0.10.0...v0.20.0)

---
updated-dependencies:
- dependency-name: vllm
  dependency-version: 0.20.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

src/fara/vllm/requirements.txt

@@ -1,4 +1,4 @@
 uvicorn
 fastapi
-vllm==0.10.0
+vllm==0.20.0
 transformers==4.55.0